Curtain hook



FIG. 1 is a top and front perspective view of a curtain hook, showing our new design;

FIG. 2 is a front view thereof, the rear view being a mirror image of the front view;

FIG. 3 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

CLAIM The ornamental design for a curtain hook, as shown and described. 